1 Department of Paediatrics and Paediatric Infectious Diseases, Institute of Child's Health, Sechenov First Moscow State Medical University (Sechenov University), Moscow, Russia; Inflammation, Repair and Development Section, National Heart and Lung Institute, Faculty of Medicine, Imperial College London, London, UK. Electronic address: daniel.munblit08@imperial.ac.uk.
2 Department of Woman and Child Health and Public Health, Fondazione Policlinico Universitario A Gemelli IRCCS, Rome, Italy; Dipartimento di Scienze Biotecnologiche di Base, Cliniche Intensivologiche e Perioperatorie, Università Cattolica del Sacro Cuore, Rome, Italy; Center for Global Health Research and Studies, Università Cattolica del Sacro Cuore, Rome, Italy.
3 ISARIC Global Support Centre, Pandemic Sciences Institute, University of Oxford, Oxford, UK.
4 Department of Pulmonary Medicine, Amsterdam UMC, University of Amsterdam, Amsterdam, Netherlands.
5 Department of Pediatric Pulmonology, Emma Children's Hospital, Amsterdam University Medical Centers, Amsterdam, Netherlands; Department of Pediatrics, Tergooi MC, Hilversum, Netherlands.